• coffee
  • citation needed] Ingesting colored liquids like sports drinks, cola, coffee, tea and red wine can discolor teeth. (wikipedia.org)
  • Chlorhexidine (antiseptic mouthwash) binds to tannins, meaning that prolonged use in persons who consume coffee, tea or red wine is associated with extrinsic staining (i.e., removable staining) of teeth. (wikipedia.org)